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Civil Engineering Objective Questions { Applied Mechanics }

29. Pick up the incorrect statement from the following :
A. The C.G. of a circle is at its centre
B. The C.G. of a triangle is at the intersecton of its medians
C. The C.G. of a rectangle is at the intersection of its diagonals
D. The C.G. of a semicircle is at a distance of r/2 from the centre
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30. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of
A. 0.2 R
B. 0.3 R
D. 0.6R.
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31. The C.G. of a right circular cone lies on its axis of symmetry at a height of
A. h/2
B. h/3
C. hI4
D. hI5
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32. Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of
A. one-half of the total height above base
B. one-third of the total height above base
C. one-fourth of the total height above base
D. none of these.
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33. Centre of gravity of a trpezium of height h and parallel
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34. The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is
A. 7.5 cm
B. 5.0 cm
C. 8.75 cm
D. 7.85 cm
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35. A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be
A. r(rc + 0.25)
B. r(iT - 0.5)Tr -I- 0.25
C. rqc_-. 0.25)
D. rift+ 0.25J
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